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The former owners, who were presumably also the builders, were the counts of Werdenberg-Sargans. The bergfried (the keep, built in the 12th century) and parts of the eastern side are the oldest. The tower stands on a piece of ground that is 12 by 13 metres (39 by 43 feet) in area. At the ground floor, the tower walls have a thickness of up to 4 metres (13 feet). The original entrance lay at the courtyard side at a height of 11 metres (36 feet). The chapel of St. Anna was presumably built in the Middle Ages as well. The main altar is late-gothic. In the Swabian War of 1499, the castle was burned by the Swiss Confederacy. The western side was expanded by Count Kaspar von Hohenems (1613–1640).[3][4][5][6]

The castle underwent a major restoration between 1904 and 1920, then again in the early 1920s during the reign of Prince Johann II, and was expanded during the early 1930s by Prince Franz Joseph II. Since 1938, the castle has been the primary residence of Liechtenstein's Princely Family. The castle is not open to the public as the princely family still lives in the castle.[8][9][10]